A sewage treatment system and method based on coupling of freeze crystallization and vacuum sublimation

Abstract

The application discloses a sewage treatment system and method based on coupling of frozen crystallization and vacuum sublimation, which is suitable for treatment of high-salinity wastewater, refractory organic wastewater and heavy metal wastewater, and comprises a raw water precooling treatment unit, a frozen crystallization unit, a vacuum sublimation unit, a water vapor condensation unit and a control unit; after being cooled by the precooling treatment unit, raw water enters the frozen crystallization unit, a low-temperature rotating wheel rotates in a condensation chamber, and an ice layer is formed on the surface. The ice layer carrying pollutants enters a vacuum sublimation chamber, sublimates under vacuum and low-temperature conditions, water vapor is recovered after condensation, and pollutants such as salts are collected by a drawer-type collection tank. The control unit automatically adjusts process parameters according to real-time monitoring data, and efficient and stable treatment is realized. The application adopts a coupling process design, combines frozen crystallization with vacuum sublimation, synchronously realizes water purification and salt recovery, links a precooling unit with a water vapor condensation unit, and greatly reduces energy consumption compared with a traditional evaporation method.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a wastewater treatment system and method based on the coupling of freeze crystallization and vacuum sublimation. Background Technology

[0002] Existing wastewater treatment technologies (such as chemical precipitation, reverse osmosis, and evaporation concentration) generally suffer from high energy consumption, large equipment investment, and the risk of secondary pollution. For example, the energy consumption of multi-effect evaporation processes for treating high-salinity wastewater can reach 90 yuan per cubic meter, and the equipment suffers from severe corrosion. While freezing is an emerging technology with advantages such as low energy consumption and environmental friendliness, traditional freezing equipment (such as freeze-thaw systems for suspended wastewater treatment) suffers from low ice crystal purity and insufficient salt separation efficiency. Furthermore, natural freezing methods are limited by geographical location and season, making continuous and stable operation difficult. Summary of the Invention

[0003] The purpose of this invention is to provide a wastewater treatment system and method based on the coupling of freeze crystallization and vacuum sublimation, which can achieve efficient separation of water and pollutants and simultaneously recover salt resources, thereby overcoming the shortcomings of the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A wastewater treatment system based on the coupling of freeze crystallization and vacuum sublimation includes a raw water precooling unit, a freeze crystallization unit, a vacuum sublimation unit, a steam condensation unit, and a control unit. The raw water precooling unit condenses the raw water into steam using a vortex tube device and sends the condensed steam to the freeze crystallization unit. The freeze crystallization unit includes a low-temperature rotor filled with a low-temperature cryogenic liquid, which forms an ice layer on the surface of the steam from the raw water precooling unit. The ice layer is scraped off by a scraper and enters the vacuum sublimation unit. The vacuum sublimation unit uses a vacuum pump to sublimate the ice layer into steam, which is then transported to the steam condensation unit. The steam condensation unit condenses the sublimated steam into liquid water, achieving a recycling of the cooling capacity. The control unit integrates a temperature sensor, a vacuum sensor, and a fuzzy logic controller to adjust the freezing temperature, vacuum level, and rotor speed of each unit in real time.

[0006] Furthermore, the raw water precooling treatment unit includes a sewage pipe for receiving raw water, the sewage pipe is set in a condensate collection tank, a detachable pipe is installed at the inlet of the sewage pipe, an internal garbage isolation net is set at the connection between the detachable pipe and the sewage pipe, and an external garbage isolation net is set at the inlet of the detachable pipe.

[0007] Furthermore, the vortex tube device is installed on the upper surface of the sewage pipe. One end of the vortex tube device is connected to the hot air outlet of the vortex tube, and the other end is connected to the cold air outlet of the vortex tube. The cold air outlet of the vortex tube is connected to the cold air pre-cooled sewage outlet of the vortex tube through a tee. The cold air pre-cooled sewage outlet of the vortex tube is located inside the sewage pipe. The sewage pipe is also equipped with a sluice channel. One side of the sluice channel is connected to the cold air outlet of the vortex tube, and a gas check valve is provided at the connection point. The gas check valve is connected to the cold air condensate vapor outlet of the vortex tube. The other side of the sluice channel is connected to the vacuum pump outlet of the vacuum pump.

[0008] Furthermore, the cryogenic crystallization unit includes a condensation chamber and a wastewater chamber, with a low-temperature rotor disposed within the space formed by the condensation chamber and the wastewater chamber; a scraper is disposed above the low-temperature rotor for scraping off the ice layer on the surface of the low-temperature rotor, and an ice-dropping platform is provided below the scraper for receiving the ice layer, with a rigid one-way waterproof device and a flexible one-way waterproof device respectively provided at the connection points between the ice-dropping platform and the condensation chamber; a rotor shaft and a refrigerant inspection port are provided at the center of the low-temperature rotor, and refrigerant pipes are arranged on the inner wall of the low-temperature rotor.

[0009] Furthermore, the vacuum sublimation unit includes a vacuum sublimation chamber and a drawer-type collection tank located below the vacuum sublimation chamber, with a refrigeration module at the bottom of the drawer-type collection tank; a one-way airtight device is provided at the junction of the vacuum sublimation chamber and the condensation chamber.

[0010] Furthermore, one end of the vacuum pump is connected to the vacuum pump outlet pipe, which is connected to the vacuum pump outlet, and the other end of the vacuum pump is connected to the vacuum pump inlet pipe, which is located in the vacuum sublimation chamber.

[0011] Furthermore, the water vapor condensation unit consists of a water trough and vortex tube cold air condensation water vapor outlet and vacuum pump outlet located on both sides of the water trough. Water vapor is ejected through the vacuum pump outlet, collides with the cold air at the vortex tube cold air condensation water vapor outlet, and then flows into the condensate collection tank through the water trough. A drain hole is provided at the bottom corner of the condensate collection tank, and the water is led out for secondary use through the drain hole.

[0012] This invention also provides another technical solution: a wastewater treatment method based on the coupling of freeze crystallization and vacuum sublimation, comprising the following steps:

[0013] S1: Equipment Installation: Connect the raw water precooling treatment unit, the freezing crystallization unit, the vacuum sublimation unit, and the water vapor condensation unit, ensuring that each component is well sealed;

[0014] S2: Parameter adjustment by the control unit: Initial parameters, including freezing temperature, vacuum level, and rotor speed, are set through the fuzzy logic controller;

[0015] S3: Running:

[0016] S301: The external garbage isolation net of the raw water enters the pipeline to separate larger debris, and then enters the removable pipeline. The internal garbage isolation net of the pipeline keeps smaller debris in the removable pipeline, and the removable pipeline is cleaned regularly.

[0017] S302: Raw water enters the sewage pipe, and after the raw water is pre-cooled by the cold air sprayed from the sewage outlet of the vortex tube, the raw water enters the sewage chamber.

[0018] S303: The low-temperature refrigerant inside the low-temperature rotor lowers the temperature of the refrigerant in the refrigerant pipeline. The raw water condenses into ice on the surface of the low-temperature rotor and is scraped off by the scraper to the ice-falling platform. Under the action of gravity, it falls into the drawer-type collection tank through the one-way airtight device, and the refrigeration starts from the refrigeration module at the bottom of the drawer-type collection tank.

[0019] S304: The vacuum pump extracts the gas in the vacuum sublimation chamber, accelerating the sublimation of ice. Water vapor is ejected from the vacuum pump outlet through the vacuum pump inlet pipe. After colliding with the cold air outlet of the vortex tube, the water vapor flows into the condensate collection tank through the sluice box and is then led out for secondary use through the drain hole.

[0020] S4: The control unit monitors the water quality and energy consumption of the produced water during the operation of S3 in real time, and adjusts the process parameters based on the feedback.

[0021] S5: Maintenance: Regularly clean the condenser and cryogenic impeller, and replace the cryogenic refrigerant to ensure long-term stable operation of the equipment.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. The wastewater treatment system and method based on the coupling of freeze crystallization and vacuum sublimation of the present invention are designed with the following coupling process: freeze crystallization and vacuum sublimation are combined to simultaneously achieve water purification and salt recovery, with a salt separation efficiency of over 97% and the quality of the produced water meeting the standards for circulating cooling water.

[0024] 2. The wastewater treatment system and method of the present invention based on the coupling of freeze crystallization and vacuum sublimation has the function of recycling cold energy: the precooling unit is linked with the water vapor condensation unit, and the energy consumption is reduced by more than 62.5% compared with the traditional evaporation method.

[0025] 3. The wastewater treatment system and method based on the coupling of freeze crystallization and vacuum sublimation of the present invention features intelligent control: a fuzzy logic controller is used to optimize process parameters, adapt to water quality fluctuations, and improve system operation stability by 30%. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the device structure of the present invention;

[0027] Figure 2This is a perspective view of the device structure of the present invention;

[0028] Figure 3 This is an external structural diagram of the device structure of the present invention.

[0029] In the diagram: 1. External garbage isolation net for the pipeline; 2. Detachable pipeline; 3. Internal garbage isolation net for the pipeline; 4. Hot gas outlet of the vortex tube; 5. Vortex tube device; 6. Cold gas outlet of the vortex tube; 7. Gas check valve; 8. Cold gas condensate vapor outlet of the vortex tube; 9. Vacuum pump outlet; 10. Condensation chamber; 11. Vacuum pump outlet pipe; 12. Scraper; 13. Vacuum pump; 14. Vacuum pump inlet pipe; 15. Vacuum sublimation chamber; 16. Single 17. Airtight device; 18. Rotor shaft and refrigerant inspection port; 19. Flexible one-way waterproof device; 20. Rigid one-way waterproof device; 21. Sewage chute; 22. Vortex tube pre-cooled sewage outlet; 23. Sewage pipe; 24. Condensate collection tank; 25. Drain hole; 26. Sewage chamber; 27. Low-temperature refrigerant; 28. Low-temperature rotor; 29. ​​Refrigerant pipe; 30. Ice drop platform; 31. Drawer-type collection tank; 32. Refrigeration module. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1-3This invention provides a wastewater treatment system based on the coupling of freeze crystallization and vacuum sublimation, comprising a raw water precooling unit, a freeze crystallization unit, a vacuum sublimation unit, a steam condensation unit, and a control unit. The raw water precooling unit condenses steam from the raw water using a vortex tube device 5 to reduce refrigeration energy consumption, and then sends the condensed steam to the freeze crystallization unit. The freeze crystallization unit includes a low-temperature rotor 27 with a rotation speed of 5-10 r / min. The low-temperature rotor 27 is filled with a low-temperature cryogenic liquid 26 (ethylene glycol solution) to form an ice layer on the surface of the steam from the raw water precooling unit. The ice layer is controlled by a scraper 12. After being scraped off, the ice enters the vacuum sublimation unit. The vacuum sublimation unit uses a vacuum of 0.1-0.5 kPa and a temperature of -10 to -20°C to sublimate the ice layer into water vapor. Salts and other contaminants adhere to the surface of the low-temperature rotor 27. Specifically, the vacuum sublimation unit uses a vacuum pump 13 to sublimate the ice layer into water vapor and then transports it to the water vapor condensation unit. The water vapor condensation unit condenses the sublimated water vapor into liquid water, realizing the recycling of cooling capacity. In this embodiment, the control unit integrates a temperature sensor, a vacuum sensor, and a fuzzy logic controller to adjust the freezing temperature, vacuum level, and rotor speed of each unit in real time to ensure stable system operation.

[0032] In the above embodiments, the raw water precooling treatment unit of the present invention includes a sewage pipe 22 for receiving raw water, the sewage pipe 22 being disposed within a condensate collection tank 23, a detachable pipe 2 being installed at the inlet of the sewage pipe 22, an internal garbage isolation net 3 being provided at the connection between the detachable pipe 2 and the sewage pipe 22, and an external garbage isolation net 1 being provided at the inlet of the detachable pipe 2; a vortex tube device 5 being installed on the upper surface of the sewage pipe 22, one end of the vortex tube device 5 being connected to the vortex tube hot air outlet. One end is connected to the vortex tube cold air outlet 6, and the other end is connected to the vortex tube cold air pre-cooled sewage outlet 21 via a tee. The vortex tube cold air pre-cooled sewage outlet 21 is located inside the sewage pipe 22. The sewage pipe 22 is also equipped with a sluice trough 20. One side of the sluice trough 20 is connected to the vortex tube cold air outlet 6, and a gas check valve 7 is provided at the connection point. The gas check valve 7 is connected to the vortex tube cold air condensate steam outlet 8. The other side of the sluice trough 20 is connected to the vacuum pump outlet 9 of the vacuum pump 13.

[0033] As one feasible embodiment, the cryogenic crystallization unit of the present invention includes a condensation chamber 10 and a wastewater chamber 25, with a low-temperature rotor 27 disposed within the space formed by the condensation chamber 10 and the wastewater chamber 25; a scraper 12 is disposed above the low-temperature rotor 27 for scraping off the ice layer on the surface of the low-temperature rotor 27, and an ice-receiving platform 29 is provided below the scraper 12 for receiving the ice layer, with a rigid one-way waterproof device 19 and a flexible one-way waterproof device 18 respectively provided at the connection points between the ice-receiving platform 29 and the condensation chamber 10; a rotor shaft and a refrigerant inspection port 17 are provided at the center of the low-temperature rotor 27, and refrigerant pipes 28 are arranged on the inner wall of the low-temperature rotor 27.

[0034] As one feasible embodiment, the vacuum sublimation unit of the present invention includes a vacuum sublimation chamber 15 and a drawer-type collection tank 30 located below the vacuum sublimation chamber 15. The bottom of the drawer-type collection tank 30 is provided with a refrigeration module 31. A one-way airtight device 16 is provided at the junction of the vacuum sublimation chamber 15 and the condensation chamber 10. One end of the vacuum pump 13 is connected to the vacuum pump outlet pipe 11, which is connected to the vacuum pump outlet 9. The other end of the vacuum pump 13 is connected to the vacuum pump inlet pipe 14, which is located inside the vacuum sublimation chamber 15.

[0035] In the above embodiment, the water vapor condensation unit of the present invention consists of a water trough 20 and a vortex tube cold air condensation water vapor outlet 8 and a vacuum pump outlet 9 located on both sides of the water trough 20. Water vapor is ejected through the vacuum pump outlet 9, collides with the cold air at the vortex tube cold air condensation water vapor outlet 8, and then flows into the condensate collection tank 23 through the water trough 20. A drain hole 24 is provided at the bottom corner of the condensate collection tank 23, and the water is led out for secondary use through the drain hole 24.

[0036] In the above embodiments, the working principle of the system of the present invention is as follows: Raw water is cooled by the pre-cooling treatment unit and then enters the freezing crystallization unit. The low-temperature rotor 27 rotates in the condensation chamber 10, forming an ice layer on its surface. The ice layer carries pollutants into the vacuum sublimation chamber 15, where it sublimates under vacuum and low-temperature conditions. Water vapor is recovered after condensation, while pollutants such as salts are collected by the drawer-type collection tank 30. The control unit automatically adjusts the process parameters based on real-time monitoring data to achieve efficient and stable treatment.

[0037] To further illustrate the feasibility of the above system, embodiments of the present invention also provide: a wastewater treatment method based on the coupling of freeze crystallization and vacuum sublimation, comprising the following steps:

[0038] S1: Equipment Installation: Connect and install the raw water precooling treatment unit, freezing crystallization unit, vacuum sublimation unit, and water vapor condensation unit in sequence according to the above structural positions, ensuring that each component is well sealed;

[0039] S2: Parameter adjustment is performed by the control unit: initial parameters are set through the fuzzy logic controller, such as freezing temperature -15℃, vacuum degree 0.3kPa, and rotor speed 8r / min;

[0040] S3: Operation: Raw water enters the external garbage isolation net 1 at a flow rate of 5 m³ / h, first isolating larger debris, and then enters the detachable pipe 2. The internal garbage isolation net 3 keeps smaller debris and primary sludge within the detachable pipe 2, and the detachable pipe 2 is cleaned regularly. Raw water enters the sewage pipe 22. After the vortex tube pre-cools the sewage outlet 21, the raw water enters the sewage chamber 25. The low-temperature chilled liquid 26 inside the low-temperature rotor 27 lowers the refrigerant temperature in the refrigerant pipe 28, allowing the raw water to cool further. Ice condenses on the surface of the low-temperature rotor 27 and is scraped off by the scraper 12 onto the ice-falling platform 29. Under the action of gravity, it falls into the drawer-type collection tank 30 through the one-way airtight device 16. The refrigeration module 31 at the bottom of the drawer-type collection tank 30 begins to refrigerate it. The vacuum pump 13 extracts the gas from the vacuum sublimation chamber 15 to accelerate the sublimation of the ice. Water vapor is ejected from the vacuum pump outlet 9 through the vacuum pump inlet pipe 14. After colliding with the cold air at the vortex tube cold air condensate water vapor outlet 8, it flows into the condensate collection tank 23 through the sluice trough 20 and is led out for secondary use through the drain hole 24.

[0041] S4: The control unit monitors the water quality and energy consumption of the produced water during the operation of S3 in real time, and adjusts the process parameters based on the feedback.

[0042] S5: Maintenance: Regularly clean the condenser chamber 10 and the cryogenic rotor 27, and replace the cryogenic coolant 26 to ensure long-term stable operation of the equipment.

[0043] In summary, this invention provides a wastewater treatment system and method based on the coupling of freeze crystallization and vacuum sublimation. By employing a coupled process design, freeze crystallization and vacuum sublimation are combined to simultaneously purify water and recover salts, achieving a salt separation efficiency of over 97%, and producing water that meets the standards for circulating cooling water. Secondly, by linking the pre-cooling unit with the steam condensation unit, energy consumption is reduced by more than 62.5% compared to traditional evaporation methods. Furthermore, by using a fuzzy logic controller in the control unit to optimize process parameters, the system adapts to water quality fluctuations, improving operational stability by 30%.

[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wastewater treatment system based on the coupling of freeze crystallization and vacuum sublimation, characterized in that, The system includes a raw water precooling unit, a freezing crystallization unit, a vacuum sublimation unit, a water vapor condensation unit, and a control unit. The raw water precooling unit condenses water vapor from the raw water using a vortex tube device (5) and sends the condensed water vapor to the freezing crystallization unit. The freezing crystallization unit includes a low-temperature rotor (27) filled with low-temperature cryogenic liquid (26) to form an ice layer on the surface of the water vapor from the raw water precooling unit. The ice layer is scraped off by a scraper (12) and then enters the vacuum sublimation unit. The vacuum sublimation unit sublimates the ice layer into water vapor using a vacuum pump (13) and then sends it to the water vapor condensation unit. The sublimated water vapor is condensed into liquid water by the water vapor condensation unit, realizing the recycling of cold energy. The control unit integrates a temperature sensor, a vacuum sensor, and a fuzzy logic controller to adjust the freezing temperature, vacuum level, and rotor speed of each unit in real time.

2. The wastewater treatment system based on the coupling of freeze crystallization and vacuum sublimation as described in claim 1, characterized in that: The raw water precooling treatment unit includes a sewage pipe (22) for receiving raw water. The sewage pipe (22) is set in a condensate collection tank (23). A detachable pipe (2) is installed at the inlet of the sewage pipe (22). An internal garbage isolation net (3) is set at the connection between the detachable pipe (2) and the sewage pipe (22). An external garbage isolation net (1) is set at the inlet of the detachable pipe (2).

3. The wastewater treatment system based on the coupling of freeze crystallization and vacuum sublimation as described in claim 2, characterized in that: The vortex tube device (5) is installed on the upper surface of the sewage pipe (22). One end of the vortex tube device (5) is connected to the hot gas outlet (4) of the vortex tube, and the other end is connected to the cold gas outlet (6) of the vortex tube. The cold gas outlet (6) of the vortex tube is connected to the cold gas pre-cooled sewage outlet (21) of the vortex tube through a tee. The cold gas pre-cooled sewage outlet (21) of the vortex tube is located inside the sewage pipe (22). The sewage pipe (22) is also provided with a sluice (20). One side of the sluice (20) is connected to the cold gas outlet (6) of the vortex tube, and a gas check valve (7) is provided at the connection. The gas check valve (7) is connected to the cold gas condensate steam outlet (8) of the vortex tube. The other side of the sluice (20) is connected to the vacuum pump outlet (9) of the vacuum pump (13).

4. A wastewater treatment system based on the coupling of freeze crystallization and vacuum sublimation as described in claim 3, characterized in that: The cryogenic crystallization unit includes a condensation chamber (10) and a wastewater chamber (25). The low-temperature rotor (27) is located in the space formed by the condensation chamber (10) and the wastewater chamber (25). The scraper (12) is located above the low-temperature rotor (27) and is used to scrape off the ice layer on the surface of the low-temperature rotor (27). Below the scraper (12) is an ice-dropping platform (29) for receiving the ice layer. At the connection between the two ends of the ice-dropping platform (29) and the condensation chamber (10), a rigid one-way waterproof device (19) and a flexible one-way waterproof device (18) are respectively provided. The center of the low-temperature rotor (27) is provided with a rotor shaft and a refrigerant inspection port (17). A refrigerant pipe (28) is arranged on the inner wall of the low-temperature rotor (27).

5. A wastewater treatment system based on the coupling of freeze crystallization and vacuum sublimation as described in claim 4, characterized in that: The vacuum sublimation unit includes a vacuum sublimation chamber (15) and a drawer-type collection tank (30) located below the vacuum sublimation chamber (15). The bottom of the drawer-type collection tank (30) is provided with a refrigeration module (31). A one-way airtight device (16) is provided at the junction of the vacuum sublimation chamber (15) and the condensation chamber (10).

6. A wastewater treatment system based on the coupling of freeze crystallization and vacuum sublimation as described in claim 5, characterized in that: One end of the vacuum pump (13) is connected to the vacuum pump outlet pipe (11), the vacuum pump outlet pipe (11) is connected to the vacuum pump outlet (9), and the other end of the vacuum pump (13) is connected to the vacuum pump inlet pipe (14), which is located in the vacuum sublimation chamber (15).

7. A wastewater treatment system based on the coupling of freeze crystallization and vacuum sublimation as described in claim 6, characterized in that: The water vapor condensation unit consists of a water trough (20) and vortex tube cold air condensation water vapor outlet (8) and vacuum pump outlet (9) located on both sides of the water trough (20). Water vapor is ejected through the vacuum pump outlet (9), collides with the cold air at the vortex tube cold air condensation water vapor outlet (8), and flows into the condensate collection tank (23) through the water trough (20). The condensate collection tank (23) is provided with a drain hole (24) at the bottom corner, and the water is led out for secondary use through the drain hole (24).

8. A wastewater treatment method based on the coupling of freeze crystallization and vacuum sublimation, implemented based on the wastewater treatment system based on the coupling of freeze crystallization and vacuum sublimation as described in claim 7, characterized in that, Includes the following steps: S1: Equipment Installation: Connect the raw water precooling treatment unit, the freezing crystallization unit, the vacuum sublimation unit, and the water vapor condensation unit, ensuring that each component is well sealed; S2: Parameter adjustment by the control unit: Initial parameters, including freezing temperature, vacuum level, and rotor speed, are set through the fuzzy logic controller; S3: Running: S301: Raw water enters the pipe and the external garbage isolation net (1) separates larger debris, and then enters the detachable pipe (2). The internal garbage isolation net (3) of the pipe leaves smaller debris in the detachable pipe (2), and the detachable pipe (2) is cleaned regularly. S302: Raw water enters the sewage pipe (22), and after the vortex tube cold air pre-cools the sewage outlet (21), the raw water enters the sewage chamber (25). S303: The low-temperature liquid (26) inside the low-temperature rotor (27) lowers the temperature of the refrigerant in the refrigerant pipe (28). The raw water condenses into ice on the surface of the low-temperature rotor (27) and is scraped off by the scraper (12) to the ice drop platform (29). Under the action of gravity, it falls into the drawer-type collection tank (30) through the one-way airtight device (16) and begins to cool from the refrigeration module (31) at the bottom of the drawer-type collection tank (30). S304: The vacuum pump (13) extracts the gas in the vacuum sublimation chamber (15) to accelerate the sublimation of ice. Water vapor is ejected from the vacuum pump outlet (9) through the vacuum pump inlet pipe (14), collides with the cold air at the vortex tube cold air condensate water vapor outlet (8), and flows into the condensate collection tank (23) through the sluice (20). It is then led out for secondary use through the drain hole (24). S4: The control unit monitors the water quality and energy consumption of the produced water during the operation of S3 in real time, and adjusts the process parameters based on the feedback. S5: Maintenance: Regularly clean the condenser (10) and cryogenic impeller (27), and replace the cryogenic coolant (26) to ensure long-term stable operation of the equipment.

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